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Daewoo SD-7500 Service Manual
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Daewoo SD-7500 Service Manual

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DAEWOO
SD-7500
MODEL
MC-Service
SERVICE MANUAL

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Summary of Contents for Daewoo SD-7500

  • Page 1 DAEWOO SD-7500 MODEL MC-Service SERVICE MANUAL...
  • Page 2 In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr). DAEWOO ELECTRONICS Corp. http : //svc.dwe.co.kr July. 2003...

  • Page 3: Table Of Contents

    CONTENTS SPECIFICATIONS .......................2 ADVANTAGES OF THIS PRODUCT..................3 TROUBLE SHOOTING........................5 WAVEFORMS ..........................23 CIRCUIT DIAGRAM........................26 PCB CIRCUIT BOARD........................36 INSTRUMENT DISASSEMBLY .....................39 ELECTRICAL PARTSLIST......................45 MC-Service...

  • Page 4: Specifications

    SPECIFICATIONS Power 230V~, 50/60Hz Consumed electricity Weight 4.6kg Dimension (W x H x D) 435mmx93mmx255mm Operative temperature +5¡C~40¡C Installation condition Horizontal / Relative humidity under 80% Signal type PAL COLOR Antenna Input/output U/V-mixed: 75Ω unbalanced VIDEO input 1.0Vp-p (unbalanced, RCA JACK) AUDIO input -8.8dBm, RCA JACK VIDEO output (common use of DVD and VCR)

  • Page 5: Advantages Of This Product

    ADVANTAGES OF THIS PRODUCT ¥ DVD, VCD, CD, CD-R(MP3), CD-RW, VHS ¥ Watching DVD for recording broadcast ¥ Integrated remote control (VCR, DVD) ¥ VISS function ¥ Multiplex sound playback/record ¥ High Sound Quality of 6 head Hi-Fi ¥ Simple record function ¥...
  • Page 6 ADVANTAGES OF THIS PRODUCT ¥ Multi Subtitle function (DVD) The subtitle can be seem in up to 32 languages. In the case of SVCD or VCD, it depends on the disc. (The number of subtitle languages depends on the software.) ¥...

  • Page 7: Troubleshooting

    TROUBLESHOOTING 1. POWER CIRCUIT CAUTION You must use insulated transformer during the first part test of POWER circuit. No power Exchange POWER CORD POWER cord is ok? Is 400V~200V voltage Check F801. obtained at C804 +? Output voltage of 2 Check IC501, IC701 parts is normal? Check...
  • Page 8 TROUBLESHOOTING 2. SYSTEM CIRCUIT A. LED DISPLAY No LED display. Is 5V obtained at IC701 Check R588, D857, L503, L860 pin #9, 25? Oscillation at IC701pin #1? Exchange IC701. Specific GRID/SEG doesnÕt function. Check IC 701 pin #22~24, 27, GRID output at PORT of IC701? 28, 30, 31.
  • Page 9 TROUBLESHOOTING B-1. Bad playback quality (1) Noise appears on the playback screen. Is noise diminished by tracking Re-adjust PATH. adjustment. Noise band is trembled up and Noise appears on the screen even Re-adjust PATH. down? though changing tape. Is there CTL pulse at IC501 Re-adjust the height of AC HEAD.
  • Page 10 TROUBLESHOOTING C. No broadcasting signal received No broadcasting signal received Is the output at IC501 pin# 61(CLK), Check IC 501. 62 (DATA) normal? Is SIF,Video output at TMI(RF101) Check TMI (RF101) Block. pin#22,24 normal? Is Video Signal input at IC501 Check IC301.
  • Page 11 TROUBLESHOOTING D. No CASSETTE Loading Cassette tape isnÕt inserted. Is 5V voltage obtained at Loading Check at EVER 14V parts IC501 pin#2? Check Q850. Is 14V voltage obtained at Check D851 and POWER circuit. Capstan Motor P501 pin#2? Connect Capstan and Loading Motor. Is 13V voltage obtained at Each Check connector and Capstan Motor.
  • Page 12 TROUBLESHOOTING F. DRUM Motor stops DRUM Motor stops. Is 14V voltage obtained at P501 Check EVER 14V pin#8? (Q850). Is DRUM PWM fit to IC 501 Check DRUM PG/FG pin#76? (IC 501 pin# 90). Is 2.6V voltage obtained at Check R534,R535,C519,C520. P501 pin#12? Check Capstan Motor and DRUM Motor.
  • Page 13 TROUBLESHOOTING 3. VIDEO circuit A. EE screen doesnÕt appear EE MODE Picture NG Is Video signal input at Check IF and LINE IN JACK. IC301 pin#48,50,52,54? Is 5V supplied at Check POWER circuit. pin#42,55,72,91of IC301? Check IC501 Is C.S, DATA, CLOCK signal pin #58,71,72.
  • Page 14 TROUBLESHOOTING B. Playback picture doesnÕt appear PB video signal missing. Is Envelope output from IC301 Is 5V supplied at IC301 pin#91? Check POWER 5V. pin#79? Is SW Pulse input at IC301 Check IC601 pin#18. pin#70? Clean head or Replace head. Is Y SIGNAL output at IC301 Is 5V obtained at IC301 pin#24, Check POWER 5V.
  • Page 15 TROUBLESHOOTING C. No recording Record video signal poor. Check EE MODE. Is luminance and color signal Is signal input into IC301 output from IC301 pin#78? pin# 48,50,52,54,56? Check POWER circuit. Is +5V supplied at IC301 pin#91? Check IC501 pin#45. Is IC301 pin#80 REC(H) HIGH? Is VIDEO SW Pulse input at IC301 Check IC501 pin#18.
  • Page 16 TROUBLESHOOTING D. No OSD(On Screen Display) appears No OSD appears. Is 5V obtained at IC501 pin# 53, Check POWER circuit. 98, 99? Is Video signal output at IC501 Is Video signal input at IC501 Replace IC501. pin#52? pin#50? Check IC 501. Check IC 501.
  • Page 17 TROUBLESHOOTING 4. AUDIO (Hi-Fi MODEL) A. No sound in E-E mode a. RF E-E No sound in RF E-E mode Is 5V obtained at IC051 pin#1? Check Power circuit. Is there SIF signal at IC051 pin#2 Check RF101. in RF mode? Is there SIF signal out at IC051 Check IC051.
  • Page 18 TROUBLESHOOTING b. AV1 E-E No sound in AV1 E-E mode. Is 12V obtained at IC251 pin#34? Check POWER circuit. Is 5V obtained at IC251 pin#40? Check Input AV1 JACK Is Audio signal at IC251 pin#6, 7? Is Audio signal output at IC251 Are CLK and DATA obtained at Replace IC251.
  • Page 19 TROUBLESHOOTING c. AV2 E-E No sound in AV2 E-E mode. Is 12V obtained at IC251 pin#34? Check POWER circuit. Is 5V obtained at IC251 pin#40? Is Audio signal at IC251 pin#8, 9? Check Input AV2 JACK Is Audio signal output at IC251 Are CLK and DATA obtained at Replace IC251.
  • Page 20 TROUBLESHOOTING d. DVD E-E No sound in DVD E-E mode. Is there DVD Audio at PD01 pin#1, Check DVD board Is 12V obtained at ICD03 pin#8? Check POWER circuit. Is DVD Audio signaloutput at Check ICD03. ICD03 pin#1,7? Is Audio(DVD) signal at IC601 Check ICD03.
  • Page 21 TROUBLESHOOTING e. FRONT E-E No sound in Front E-E mode. Is Audio signal at IC601 pin#1, Check Input Front JACK. Is Audio signal output at IC601 pin Comparing with switching table, are SWA, B CTL SIGNAL #3, 13? right at IC601 pin #9,10? Replace IC601.
  • Page 22 B. No Hi-Fi Playback audio(PLAY MODE) Is 12V obtained at IC251 pin#34? Check POWER circuit. Is 5V obtained at IC251 pin#40? Check A.SW at IC501 Is Audio signal at IC251 pin#41? pin#19. Is Audio signal output at IC251 Are CLK and DATA obtained at Replace IC251.
  • Page 23 C. No Hi-Fi playback in record/playback mode (REC MODE) Check input LINE1 JACK. Are there Audio signal Check input LINE2 JACK. at IC251 pin#4~9? Check ICD03(DVD). Is FM OSC signal at IC251 Replace IC251 pin#36? Is FM OSC signal at P401 pin#2? Replace DRUM.
  • Page 24 TROUBLESHOOTING E. No NORMAL AUDIO playback in record/playback mode(Check in REC mode) No Normal Audio playback in record/playback mode Check Input LINE1 JACK. Are there Audio signal at IC251 Check Input LINE2 JACK. pin#4~9? Check ICD03(DVD). Is there recording signal at Check IC251.

  • Page 25: Waveforms

    WAVEFORMS 1. VIDEO (IC301-70) 5Vp-p (IC301-70)5Vp-p (IC301-46) 520mVp-p (IC301-46) 520mVp-p 1V/2msec/cm 1V/2msec/cm 200mV/5usec/cm 200mV/5usec/cm PLAY PLAY (IC301-43) 520mVp-p (IC301-43) 520mVp-p (IC301-21) 600mVp-p (IC301-21) 350mVp-p 100mV/5usec 100mV/5usec 200mV/2msec/cm 200mV/2msec/cm PLAY PLAY(SP) VIDEO SW TRIG PLAY(EP) VIDEO SW TRIG (IC301-67) 4.6Vp-p (IC301-67) 4.6Vp-p (IC301-65) 2.2Vp-p (IC301-65) 2.2Vp-p 2V/10usec/cm...
  • Page 26 WAVEFORMS 2. AUDIO 2-1 AUDIO(Normal) (IC301-15) 100mVp-p (IC301-11) 1.5Vp-p (IC301-100) 2.3Vp-p (IC301-8) 120mVp-p 20mV/0.5msec/cm 0.5V/0.5msec/cm 0.5V/0.5msec/cm 50mV/0.5msec/cm PLAY (P202-2) 75Vp-p 10V/20µsec/cm 2-2 AUDIO(Hi-Fi) (IC251-2) 80mVp-p (IC251-24) 200mVp-p (IC251-34) 1.4Vp-p (IC251-32) 200mVp-p 20mV/0.5msec 50mV/0.5msec 0.5V/1msec 50mV/0.5msec EE/REC/PLAY EE/REC EE/REC (IC251-16) 1.4Vp-p 0.5V/0.5msec MC-Service EE/REC...
  • Page 27 WAVEFORMS 3. SERVO/SYSCON “ (IC601-18) 5Vp-p (IC601-77) 5Vp-p (IC601-76) 5Vp-p (IC601-94) 3Vp-p 2V/5msec/cm 2V/5µsec/cm 2V/5µsec/cm 1V/5msec/cm REC/PLAY REC/PLAY REC/PLAY ‘ (IC601-97) 4.4Vp-p (IC601-90)25Vp-p&5Vp-p (IC601-87) 2.5Vp-p (IC601-38) 2.6Vp-p 1V/5msec/cm 1V/5msec/cm 1V/0.2msec/cm 0.5V/0.1µsec/cm PLAY REC/PLAY REC/PLAY REC/PLAY...

  • Page 28: Circuit Diagram

    CIRCUIT DIAGRAM 1. POWER SUPPLY CIRCUIT DIAGRAM MC-Service...
  • Page 29 CIRCUIT DIAGRAM 2. SERVO & SYSCON CIRCUIT DIAGRAM COPY MC-Service...
  • Page 30 CIRCUIT DIAGRAM 3. VIDEO/AUDIO CIRCUIT DIAGRAM MC-Service...
  • Page 31 CIRCUIT DIAGRAM 4. HiFi & SW & INPUT CIRCUIT DIAGRAM MC-Service...
  • Page 32 CIRCUIT DIAGRAM 5. PIF CIRCUIT DIAGRAM MC-Service...
  • Page 33 CIRCUIT DIAGRAM 6. DVD CIRCUIT DIAGRAM MC-Service...
  • Page 34 CIRCUIT DIAGRAM MC-Service...
  • Page 35 CIRCUIT DIAGRAM MC-Service...
  • Page 36 CIRCUIT DIAGRAM MC-Service...
  • Page 37 CIRCUIT DIAGRAM MC-Service...

  • Page 38: Pcb Circuit Board

    PCB CIRCUIT BOARD 1-1 . VCR (MAIN) MC-Service...
  • Page 39 PCB CIRCUIT BOARD 1-2. POWER MC-Service...
  • Page 40 PCB CIRCUIT BOARD 1-3. DVD (MAIN) MC-Service...

  • Page 41: Instrument Disassembly

    INSTRUMENT DISASSEMBLY 1. DECK DISASSEMBLY Perform all disassembly procedures in the order presented. When reassembling, use the reverse procedure. Make sure that all leads/ wiring are routed correctly when reassembling. A. TOP COVER REMOVAL @ Remove two screws # Remove two screws ! Remove three screws FIG.
  • Page 42 INSTRUMENT DISASSEMBLY B. PANEL FRONT DISASSEMBLY @ Remove 2 Hooks at left and right sides, Simultaneously, remove panel. ! Remove 3 Hooks at bottom FIG.2 C. LOGIC PCB DISASSEMBLY Remove 2 screws, then remove Logic FIG.3 MC-Service...
  • Page 43 INSTRUMENT DISASSEMBLY D. DECK AND MAIN PARTS DISASSEMBLY ! Remove 6 screws, then remove DECK @ Remove 4 screws, then remove LOADER # Remove 3 screws, then remove POWER PCB FIG. 4...
  • Page 44 INSTRUMENT DISASSEMBLY E. MAIN PCB DISASSEMBLY @ Remove 2 screws, then remove MAIN PCB ! Remove 2 screws FIG. 5 MC-Service...
  • Page 45 INSTRUMENT DISASSEMBLY F. MAIN CHASSIS DISASSEMBLY ! Remove 4 screws, then remove MAIN FIG. 6...
  • Page 46 INSTRUMENT DISASSEMBLY G. Explode view MC-Service...

  • Page 47: Electrical Partslist

    ELECTRICAL PARTSLIST Caution: In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr) PARTS_CODE PARTS_NAME PARTS_DESCR...
  • Page 48 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK C369 HCBK103KBA C CHIP CERA 50V X7R 0.01MF K 1608 CD10 HCBK471KBA C CHIP CERA 50V X7R 470PF K 1608 SECAM ONLY C370 HCFH474ZBA C CHIP CERA 25V Y5V 0.47MF Z 1608 CD21 HCQK221JBA C CHIP CERA...
  • Page 49 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK R155 HRFS272JBA R CHIP 1/16 2.7K OHM J 1608 R517 HRFS102JBA R CHIP 1/16 1K OHM J 1608 R201 HRFS273JBA R CHIP 1/16 27K OHM J 1608 R518 HRFS182JBA R CHIP 1/16 1.8K OHM J 1608 R202 HRFS334JBA...
  • Page 50 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK RD54 HRFS101JBA R CHIP 1/16 100 OHM J 1608 C208 CEXF1H479A C ELECTRO 50V RSM 4.7MF 4X7 RD55 HRFS680JBA R CHIP 1/16 68 OHM J 1608 C210 CEXF1C220A C ELECTRO 16V RSM 22MF (5X7) RD59 HRFS750JBA...
  • Page 51 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK C635 CEXF1C100A C ELECTRO 16V RSM 10MF 5X7 Q204 TZTC3198Y- TRANSISTOR KTC3198Y-(1815Y) (AUTO) C637 CEXF1C100A C ELECTRO 16V RSM 10MF 5X7 Q205 TZTC3198Y- TRANSISTOR KTC3198Y-(1815Y) (AUTO) C643 CEXF1C100A C ELECTRO 16V RSM 10MF 5X7 Q206 TZTA1266Y-...
  • Page 52 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK CD14 CCZF1H104Z C CERA HIKF 50V 0.1MF Z AXIAL L602 5CPZ229K02 COIL PEAKING 2.2UH K(AXIAL 3.5MM) CD17 CZCH1H201J C CERA 50V CH 200PF J (AXIAL) L604 5CPZ229K02 COIL PEAKING 2.2UH K(AXIAL 3.5MM) CD18 CCZB1H182K C CERA...
  • Page 53 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK R403 RD-AZ122J- R CARBON FILM 1/6 1.2K OHM J RD21 RD-AZ302J- R CARBON FILM 1/6 3K OHM J R423 RD-AZ153J- R CARBON FILM 1/6 15K OHM J RD22 RD-AZ221J- R CARBON FILM 1/6 220 OHM J R512 RD-AZ472J-...
  • Page 54 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK CA32 HCFH104ZBA C CHIP CERA 25V Y5V 0.1MF Z 1608 CC44 HCFH104ZBA C CHIP CERA 25V Y5V 0.1MF Z 1608 CA33 HCFH104ZBA C CHIP CERA 25V Y5V 0.1MF Z 1608 CC45 HCFH104ZBA C CHIP CERA...
  • Page 55 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK DA03 DRLS4148-B DIODE CHIP RLS4148TE-11 3415 RA24 HRFS123JBA R CHIP 1/16 12K OHM J 1608 DB01 DDAN202K-B DIODE CHIP DAN202K T96 (AUTO) RA26 HRFS103JBA R CHIP 1/16 10K OHM J 1608 DC01 DRLS4148-B DIODE CHIP...
  • Page 56 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK RC27 HRFS472JBA R CHIP 1/16 4.7K OHM J 1608 RP03 HRFS689JBA R CHIP 1/16 6.8 OHM J 1608 RC29 HRFS201JBA R CHIP 1/16 200 OHM J 1608 RP04 HRFS689JBA R CHIP 1/16 6.8 OHM J 1608 RC30 HRFS105JBA...
  • Page 57 ELECTRICAL PARTSLIST PARTS_CODE PARTS_NAME PARTS_DESCR REMARK PARTS_CODE PARTS_NAME PARTS_DESCR REMARK F801 5FWPS2022L FUSE WIDE TL 250V 2A CASE JP801 85801060TA WIRE COPPER 0.6X52MM TAPING IC802 1KA431AZÑ IC REGULATOR KA431AZ L805 5PB13857Ñ COIL BEAD BI3857(AXIAL) Q802 TZTC3203Y- KTC3203Y (2120Y) R803 RD-4Z394JS R CARBON FILM 1/4 390K OHM J SMALL Z0082 PVPWJAE253...
  • Page 58 DAEWOO ELECTRONICS Corp. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA...

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